kdb: Remove unused flags stack

kdb_restore_flags() and kdb_save_flags() were added in 2010 by
commit 5d5314d6795f ("kdb: core for kgdb back end (1 of 2)")
but have remained unused.

Remove them, and their associated storage.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20250112012049.319515-1-linux@treblig.org
Signed-off-by: Daniel Thompson (RISCstar) <danielt@kernel.org>

diff --git a/include/linux/kdb.h b/include/linux/kdb.h
index f6c2ddb16b9587520957fd3e268eb6f61b30919f..905a2e2f45f66fcc6a285966257e4d3a51286797 100644 (file)
--- a/include/linux/kdb.h
+++ b/include/linux/kdb.h
@@ -140,9 +140,6 @@ extern const char *kdb_diemsg;
 
 extern unsigned int kdb_flags; /* Global flags, see kdb_state for per cpu state */
 
-extern void kdb_save_flags(void);
-extern void kdb_restore_flags(void);
-
 #define KDB_FLAG(flag)         (kdb_flags & KDB_FLAG_##flag)
 #define KDB_FLAG_SET(flag)     ((void)(kdb_flags |= KDB_FLAG_##flag))
 #define KDB_FLAG_CLEAR(flag)   ((void)(kdb_flags &= ~KDB_FLAG_##flag))

diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
index 1ef831cacbc260943bd40c045f31a0db3bd074f6..05b137e7dcb953a01373e63f67ff38ca132d3409 100644 (file)
--- a/kernel/debug/kdb/kdb_support.c
+++ b/kernel/debug/kdb/kdb_support.c
@@ -536,21 +536,3 @@ bool kdb_task_state(const struct task_struct *p, const char *mask)
 
        return strchr(mask, state);
 }
-
-/* Maintain a small stack of kdb_flags to allow recursion without disturbing
- * the global kdb state.
- */
-
-static int kdb_flags_stack[4], kdb_flags_index;
-
-void kdb_save_flags(void)
-{
-       BUG_ON(kdb_flags_index >= ARRAY_SIZE(kdb_flags_stack));
-       kdb_flags_stack[kdb_flags_index++] = kdb_flags;
-}
-
-void kdb_restore_flags(void)
-{
-       BUG_ON(kdb_flags_index <= 0);
-       kdb_flags = kdb_flags_stack[--kdb_flags_index];
-}